我们可以使用服务帐户访问GMAIL API吗？

Question

我有一个桌面应用程序,通过REST接口使用GMAIL API读取邮件.我想使用服务帐户,以便我们可以使用域设置下载邮件,用户交互为空.我已成功创建Gmail服务实例,但当我尝试访问任何Gmail API方法(如提取邮件列表或其他任何内容)时,我会收到例外说法

Google.Apis.Auth.OAuth2.Responses.TokenResponseException:错误:"access_denied",说明:"请求的客户端未经授权."

我完成了开发人员控制台的所有设置,并将范围添加到我的gapps域.

Gmail API是否支持服务帐户？使用相同的设置和服务帐户,我可以使用云服务和API获取Google云端硬盘中所有文件的列表.

Answer 1

我使用以下C#代码从服务帐户访问Gmail

String serviceAccountEmail =
    "999999999-9nqenknknknpmdvif7onn2kvusnqct2c@developer.gserviceaccount.com";

var certificate = new X509Certificate2(
    AppDomain.CurrentDomain.BaseDirectory +
        "certs//fe433c710f4980a8cc3dda83e54cf7c3bb242a46-privatekey.p12",
    "notasecret",
    X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.Exportable);

string userEmail = "user@domainhere.com.au";

ServiceAccountCredential credential = new ServiceAccountCredential(
    new ServiceAccountCredential.Initializer(serviceAccountEmail)
    {
        User = userEmail,
        Scopes = new[] { "https://mail.google.com/" }
    }.FromCertificate(certificate)
);

if (credential.RequestAccessTokenAsync(CancellationToken.None).Result)
{   
    GmailService gs = new GmailService(
        new Google.Apis.Services.BaseClientService.Initializer()
        {
            ApplicationName = "iLink",
            HttpClientInitializer = credential
        }
    );

    UsersResource.MessagesResource.GetRequest gr =
        gs.Users.Messages.Get(userEmail, msgId);
    gr.Format = UsersResource.MessagesResource.GetRequest.FormatEnum.Raw;
    Message m = gr.Execute();

    if (gr.Format == UsersResource.MessagesResource.GetRequest.FormatEnum.Raw)
    {
        byte[] decodedByte = FromBase64ForUrlString(m.Raw);
        string base64Encoded = Convert.ToString(decodedByte);
        MailMessage msg = new MailMessage();
        msg.LoadMessage(decodedByte);
    }
}

Answer 2

这是 python 3.7 的一些内容：

from google.oauth2 import service_account
from googleapiclient.discovery import build

def setup_credentials():
    key_path = 'gmailsignatureproject-zzz.json'
    API_scopes =['https://www.googleapis.com/auth/gmail.settings.basic',
                 'https://www.googleapis.com/auth/gmail.settings.sharing']
    credentials = service_account.Credentials.from_service_account_file(key_path,scopes=API_scopes)
    return credentials


def test_setup_credentials():
    credentials = setup_credentials()
    assert credentials


def test_fetch_user_info():
    credentials = setup_credentials()
    credentials_delegated = credentials.with_subject("tim@vci.com.au")
    gmail_service = build("gmail","v1",credentials=credentials_delegated)
    addresses = gmail_service.users().settings().sendAs().list(userId='me').execute()
    assert gmail_service